fixed scoping for local on for tag.

tests/testjet.jet

@@ -7,13 +7,13 @@
  <set name="modified1" value="ABCD" />
  $[modified1;tohex]
  <set name="tohex" value="tohex" />
+ $[tohex]
  $[modified1;$[tohex]]
  <set name="complete" value="$[modified1];$[tohex]" />
  $[complete]
  <set name="" value="xxx" />
  the unnamed variable value: [$[]]
  ---
- $[nonexistant]
  $[%HOME]
  <set name="ix" value="1" />
  <set name="theexpr" expr="SUBSTRING('abcdefg', 5 - 4, 20 - 17)" />
@@ -23,7 +23,7 @@
  <set name="division" expr="5/3" />
  <set name="divisor" value="8" />
  <set name="nested" expr="(2*(4+4)/$[divisor])*32" />
- <set name="error" value="$[x]" />
+ <set name="error" value="$[nested]" />
  $[nested]
  <set name="numbers">0123456789</set>
  <set name="lefty" expr="LEFT($[numbers],5)" />
@@ -54,11 +54,11 @@
     456
   </if>
  </if>
- <for name="ix" start="1" end="5" step="1">
-  -->#[ix]<--
+ <for name="ix" start="1" end="5" step="1" scope="local">
+  -->$[ix]<--
  </for>
  <call status="rc" pgm="/usr/bin/ls" arg1="-al" name="ls" />
- $[rc]
+ [rc]
  $[ls]
  <read file="../compile" name="file" />
  $[filex]